Pitman



U'rnrrm)l STAT-Es PATENT Carica.

ISAAC G. BOWER, OF FREMN'I, OHIO.

PITMAN.

SPECIFICATION forming part of Letters Patent No. 247,879, dated October4, 1881.

` Application tiled April 9, 1881. (No model.)

To all whom t may concern v Be it known that l, ISAAC G. BOWER, acitizen ofthe United States, residing at Fremont, in the county ofSandusky and State of Ohio, have invented certain new and usefulImprovements in Pitman; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to lettersor igures of reference marked thereon, which forln a part of thisspecification.

The object of the present invention is to provide a pitman and devicesfor connecting the" same with the wrist or crank pin and knifehead of areaping-machine, or with any other class of machinery, which will enablethe platform of the reaper to be raised and lowered and the guards to betilted without causing' the pitlnan to bind on the crank or wrist pin ofthe driving mechanism.

It has heretofore been proposed to connect a pitman with a knife orcutter bar by. means of a hinge-joint and with a' wrist or crank pin bymeans of a globular o r balljoint; but such a form of connection has notproved satisfactory by reason of the defective construction of thedevices employed.

'.Ihe aim of the present invention is to provide a pitman of asimplified construction, and strong and effective devices for connectingthe same with the knife-head and wrist or crank pin of the drivingmechanism, so that the pitman is free to turn vertically and axially forpreventing the strain or breakage thereof, aud removing all liability ofits binding on the crank-pin. These results I attain by the constructionand combination-of parts hereinafter described and claimed. Y

In the drawings, Figure lis a side elevation of a pitman and means forconnecting the same with the knife-head and crank-pin. Fig.v 2 is atransverse section taken through the knifeheadjoint of the pitman. Fig.3 is a sectional view of the globular or ball joint held in a chamberedsectional head of the pitman, and receiving the crank-pin. Fig. 4 is adetail view of one of theseetions of the ball-joint having facerilos andan oil-conducting groove. Fig. 5 is a detailview of one of the sectionsof the chambered. head which receives the ball-joint, and

tends a projection, C, approximatingr in shape l a frustum ot' a cone.Said projection has a central opening, D, which also extends through thehead A. The Haring recess B receives the colle-shaped projection E ot' ahead, F, carried by the pitinamand said projection-is provided 4with arecess, El, ofthe saine shape the projection C.

An opening I, is made through the center of the projection E and throughthe head F, and a bolt, J, passed through the openings D I is secured bya nut, K, fitted on the screwthreaded end of the bolt. A countersink orvrecess, a, made in thc head F, receives said nut.A The cone-shapedprojections and recesses on the knife and pit-man heads constitutedouble bearing-surfaces, th'e bolt J being simply the medium forconnectingthe two heads. The A screw threaded portion of said boltengages with the internal thread made in the'opening D of the projectionC, and the smooth portion of the bolt extending beyond said projectionand passing through the head F of the pitman is made somewhat smaller indiameter than the opening through which it passes.

The object ot' this construction is to prevent the pitman-headfromwearing the bolt 4and to decrease friction as much as possible by simplyresorting tothe conical projections and recesses as beariugsurfaces. Theboltv furthermore serves as a means for tightening;r the joint as thebearing-surfaces wear off. In addition to the internal bearing-surfacesI provide the head F with an external'lug or projection, L,

which has a concave surface fitting against y the circular portion ofthe head A. In this 4manner I obtain a bearing-surface especiallydesigned to resist all longitudinal strain to which the pitman may besubjected.

The pitman rod M has end screwthreads, which are ot such length thatsaid rod can be adjusted in screw-threaded sockets of the pitman-heads Fand N. Jam or locking nuts a retain the rod in position after it hasbeen properly adjusted. The head N, carried by the pitman, has anenlargement atitsinner end, which is made with a hemisph'erical orsemi-globular chamber or recess, 0, and projecting flanges?.

A cap piece, Q, having a chamber ot the same shape as the head N, isprovided with langes R, which fit against the flanges l?, andscrew-bolts S, passed throughboth sets of anges, serve to secure the capQ to the head N.

It will he manifest that the head and cap form an internal chamber of aglobular form. This chamber contains ajournal, T, of aglobular form,which is made of two parts or sections, having their contiguous facesprovided with interlocking ribs t and with a central semi-cylindricalchannel, u. These channels, when the two sections are litted together,form a cylindrical bore or opening forthe reception ofthe crank or wristpin of the driving-wheel or othermechanism. The globular-shapedjournalis left free to rotate within the chambered head N, and cap Q, or, mareproperly, the pitman can turn on said bearing without straining ordisturbing the crank or wrist pin.

In order to prevent the complete rotation of the globular-shaped journalwithin its holding box or head, I provide one of the sections of thejournal T with an externally-located conical recess, U, into whichenters a conical or tapering pin, V, projecting from the base of thechamber in the cap Q or in the head N. The crank-pin (not shown) passesthrough the apertured sides of the head N and its cap Q, and through thebore or opening of the globular journal T.

The pitman can articulate or turn on the knife-head bearing in avertical direction, so as to permit a harvester-platform and itsadjuncts to rise and fall, and a similar vertical movement combined withan additional axial or rotary movement of the pitman can freely takeplace by reason of the globular journal T, fitted into the pitman-headand embracing the crank-pin. As has already been stated, the movementot' said globular journal is limited or defined by means ofthe conicalpin and recess, which are of such a size and shape that the freemovement ofthe globular journal is notimpeded.

In order to permit the crank-pin hearing to be properly lubricated, Iprovide the head Q, or the llanges thereof', with vertical grooves W,which serve to convey7 oil admitted into the same to the globularjournal, having oil-conducting channels X on the adjoining faces of thesections composing the 4same.

Havingthus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination of the pitman-head N and end cap, Q, havin gaglobular chamber, and projection V, with the bisected globulnrjourv nalT, having a crank-pin opening, and a tapering cavity, U, as and for thepurpose set forth.

2. The bisected globular journal T, having interlocking ribs t, andoil-channel X, in combination with the pitman-head, having a globularchamber, and oil-channel W, as and i'or the purpose set forth.

In testimony whereofl affix my signature in presence ot' two witnesses.

ISAAC G. BOWER.

Witnesses:

I. C. OBRiEN, G. E. Boor.

